<template>
    <div class="widget-form-container">
        <el-form :size="data.config.size" :label-position="data.config.labelPosition" :label-width="data.config.labelWidth + 'px'">

            <draggable
                class="widget-form-list"
                v-model="data.list"
                v-bind="{group:'people', ghostClass: 'ghost'}"
                @end="handleMoveEnd"
                @add="handleWidgetAdd"
            >

                <template v-for="(element, index) in data.list">
                    <template v-if="element.type == 'grid'">
                        <div v-if="element && element.key" class="widget-grid-container data-grid" :key="element.key" style="position: relative;">
                            <el-row
                                class="widget-grid "
                                type="flex"
                                :class="{active: selectWidget.key == element.key}"
                                :gutter="element.options.gutter ? element.options.gutter : 0"
                                :justify="element.options.justify"
                                :align="element.options.align"
                                @click.native="handleSelectWidget(index)">
                                <el-col v-for="(col, colIndex) in element.columns" :key="colIndex" :span="col.span ? col.span : 0">
                                    <div style="border: 1px dashed #999;">
                                        <draggable
                                            class="widget-form-list"
                                            style="padding-bottom: 50px;"
                                            v-model="col.list"
                                            filter="widget-grid-container"
                                            v-bind="{group:'people', ghostClass: 'ghost'}"
                                            @end="handleMoveEnd"
                                            @add="handleWidgetColAdd($event, element, colIndex)"
                                        >
                                            <widget-form-item
                                                v-for="(el, i) in col.list"
                                                :key="el.key"
                                                v-if="el.key"
                                                :element="el"
                                                :select.sync="selectWidget"
                                                :index="i"
                                                :data="col"/>
                                        </draggable>
                                    </div>
                                </el-col>

                            </el-row>
                            <el-button title="删除" style="bottom: -20px;" @click.stop="handleWidgetDelete(index)" class="widget-action-delete" v-if="selectWidget.key == element.key" circle plain type="danger">
                                <!-- <icon name="icon-trash" style="width: 12px;height: 12px;"></icon> -->
                                <i class="iconfont2 icon-trash" />
                            </el-button>
                        </div>
                    </template>
                    <template v-else>
                        <widget-form-item v-if="element && element.key" :key="element.key" :element="element" :select.sync="selectWidget" :index="index" :data="data"/>
                    </template>
                </template>
            </draggable>
        </el-form>
    </div>
</template>

<script>
import Draggable from 'vuedraggable'
import WidgetFormItem from './WidgetFormItem'

export default {
    components: {
        Draggable,
        WidgetFormItem
    },
    props: ['data', 'select'],
    data() {
        return {
            selectWidget: this.select
        }
    },
    watch: {
        select(val) {
            this.selectWidget = val
        },
        selectWidget: {
            handler(val) {
                console.log(val)
                this.$emit('update:select', val)
            },
            deep: true
        }
    },
    mounted() {
        document.body.ondrop = function(event) {
            const isFirefox = navigator.userAgent.toLowerCase().indexOf('firefox') > -1
            if (isFirefox) {
                event.preventDefault()
                event.stopPropagation()
            }
        }
    },
    methods: {
        handleMoveEnd({ newIndex, oldIndex }) {
            console.log('index', newIndex, oldIndex)
        },
        handleSelectWidget(index) {
            this.selectWidget = this.data.list[index]
        },
        handleWidgetAdd(evt) {
            console.log('add', evt)
            console.log('end', evt)
            const newIndex = evt.newIndex
            const to = evt.to
            console.log(to)

            // 为拖拽到容器的元素添加唯一 key
            const key = Date.parse(new Date()) + '_' + Math.ceil(Math.random() * 99999)
            this.$set(this.data.list, newIndex, {
                ...this.data.list[newIndex],
                options: {
                    ...this.data.list[newIndex].options,
                    remoteFunc: 'func_' + key
                },
                key,
                // 绑定键值
                model: this.data.list[newIndex].type + '_' + key,
                rules: []
            })

            if (this.data.list[newIndex].type === 'radio' || this.data.list[newIndex].type === 'checkbox' || this.data.list[newIndex].type === 'select') {
                this.$set(this.data.list, newIndex, {
                    ...this.data.list[newIndex],
                    options: {
                        ...this.data.list[newIndex].options,
                        options: this.data.list[newIndex].options.options.map(item => ({
                            ...item
                        }))
                    }
                })
            }

            if (this.data.list[newIndex].type === 'grid') {
                this.$set(this.data.list, newIndex, {
                    ...this.data.list[newIndex],
                    columns: this.data.list[newIndex].columns.map(item => ({ ...item }))
                })
            }

            this.selectWidget = this.data.list[newIndex]
        },
        handleWidgetColAdd($event, row, colIndex) {
            console.log('coladd', $event, row, colIndex)
            const newIndex = $event.newIndex
            const oldIndex = $event.oldIndex
            const item = $event.item

            // 防止布局元素的嵌套拖拽
            if (item.className.indexOf('data-grid') >= 0) {
                // 如果是列表中拖拽的元素需要还原到原来位置
                item.tagName === 'DIV' && this.data.list.splice(oldIndex, 0, row.columns[colIndex].list[newIndex])

                row.columns[colIndex].list.splice(newIndex, 1)

                return false
            }

            console.log('from', item)

            const key = Date.parse(new Date()) + '_' + Math.ceil(Math.random() * 99999)

            this.$set(row.columns[colIndex].list, newIndex, {
                ...row.columns[colIndex].list[newIndex],
                options: {
                    ...row.columns[colIndex].list[newIndex].options,
                    remoteFunc: 'func_' + key
                },
                key,
                // 绑定键值
                model: row.columns[colIndex].list[newIndex].type + '_' + key,
                rules: []
            })

            if (row.columns[colIndex].list[newIndex].type === 'radio' || row.columns[colIndex].list[newIndex].type === 'checkbox' || this.data.list[newIndex].type === 'select') {
                this.$set(row.columns[colIndex].list, newIndex, {
                    ...row.columns[colIndex].list[newIndex],
                    options: {
                        ...row.columns[colIndex].list[newIndex].options,
                        options: row.columns[colIndex].list[newIndex].options.options.map(item => ({
                            ...item
                        }))
                    }
                })
            }

            this.selectWidget = row.columns[colIndex].list[newIndex]
        },
        handleWidgetDelete(index) {
            if (this.data.list.length - 1 === index) {
                if (index === 0) {
                    this.selectWidget = {}
                } else {
                    this.selectWidget = this.data.list[index - 1]
                }
            } else {
                this.selectWidget = this.data.list[index + 1]
            }

            this.$nextTick(() => {
                this.data.list.splice(index, 1)
            })
        }
    }
}
</script>
